Which one help for a better SERP? Will dynamic title cause some confusion to SEs as they see different title tags every time they crawl and thus affect the SERP?
Your title should be created dynamically, but it should be static in comparison to its URL. Meaning, if you use something like PHP to dynamically serve up content, the title should be created dynamically from the title of your content. But every time somebody visits a certain URL, they should see the same title.
Sure. I have a page where visitors post comment. Everytime a new comment added, the title will be changed to topic name + comment title. I'm doing this because the title is shown in the home page, so that a new visitor to site will see list of recently commented topic.
bentong, I got your point. But in my case the url remain same. Only the title change every time a new comment added.
Word. That could have an adverse effect on your rankings. SEs wont like it if you keep changing the title on them. Plus a persons comment might take the title way off topic compared the actual page.